You will find that your toilet will use more water with this type of pump for flushing. The pump will make a grinding noise every time you flush the toilet which is likely to irritate some users. Older models have a reputation for being unreliable and for frequently breaking down. These two things are not quite as much of a concern these days due to advances in technology, but a macerator is not likely to be quite as reliable as a regular toilet with a normal sewage pipe connection. If you use the macerator regularly, you can expect the need to replace it within two to three years.